Coffee-mill



(No Model.)

S'. H. FOUNTAIN.

COFFEE MILL.

Patented Jan. 3 1882,

WITNESSES ATTORNEYS.

INVENTOR:

a side elevation of my improved mill.

UNITED STATES PATENT OFFICE.

SETH H. FOUNTAIN, or AMITE CITY, LOUISIANA.

COFFEE-MILL.

SPECIFICATION forming part of Letters Patent No. 251,860, dated January3, 1882,

Application filed August 16, 1881. (No model.)

To all whom it may concern Be it known that I, SETH H. FOUNTAIN, ofAmite City, in the parish of Tangipahoa, in the State of Louisiana, haveinvented a new and Improved Coffee-Mill, of which the following is afull, clear, and exact descriptionh My invention relates to such millsas are usually turned by hand for grinding coffee, spices, and similarthings; and it has for its object to provide a millof this characterwhich will require less power to operate it than those of ordinaryconstruction, and one which will prevent all loss of the materialpassing through In the accompanying drawings, Figure 1. is Fig. 2 is asection of the same, taken on the line was; and Fig. 3 is a face view ofone part of the casing.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the spindle, which is provided at its endswith the cranks a a. Upon this spindle is formed the burr B, which ispreferably of prolate-spheroid a1 form, and is regularly grooved so asto form the spiral ridges b b, which come to a point at the largestperiphery of the burr and gradually diminish in size, but not in number,as they reach the smallest periphery at the ends of the burr.

The burr B is inclosed by the grindingasing, which is formed of theparts D D, which are formed with conical chambers grooved upon theinside to form the spiral edges (1 d, and which are placed upon thespindle from opposite directions, and meet immediately over and aroundthe largest periphery of the burr.

The edges (1 d are'also regularly formed in the chambers of thecasing-that is, they diminish in size, but not in nu m her, from thelargest part to the smallest part of the chambers. The edge of the partD is formed with the lip e, which fits, when the parts are in place,over the reduced outer edge, e, of the part D,- and thus forms a tightjoint. The part D is preferably cast with the bracket-arms O O forsecuring the mill in convenient position for use. The part D is securedto the part D by the setscrews f f f, and the fineness or coarseness ofthe grind of the mill maybe regulated by these screws. The parts D D ofthe casing are formed with the discharge-openings gg, which lead fromthe smallest part of the chambers and meet at the single outlet h at thebottom of the casing. At the top, parts of the casing are cut away, asshown atj in Fig. 3, to form the hopper-throat J, through which thematerial to be ground is fed to the mill at thelargest periphery of theburr.

It will he understood that owing to the ridges of the burr and of thecasing being large at the point of entrance of the material, the kernelswill be only broken at that point, and that the main grinding will bedone at the smallest periphery of the burr where the leverage isgreatest, thus rendering the mill very easy of operation.

Having thus described my invention, [claim as new and desire to secureby Letters Patent- 1. In a coffee'rnilhthe combination of a burr havinga prolate-spheroidal form and spiral ridges, gradually decreasing insize as they reach the smallest peripheries at the ends of said burr,witha correspondingly-ribbed grinding-casing, having a throat over thelargest periphery of the burr, and an outlet at each end where theridges are smallest, whereby the grain will first be broken andafterward be mainly ground at the small ends of burr, as described. I

2. The parts D D of the casing, formed with the discharge-openin gs gand g, leading from the smallest ends of the chambers, in combinationwith the burr B and the hopper-throat J, substantiallyas and forthepurposes setforth.

SETH HAMPTON FOUNTAIN.

Witnesses:

' F. P. MIX,

D. A. VERNON.

